Other Parts Discussed in Thread: BQ24074, TPS61023
I am designing a circuit for powering a 5V device from a single cell LiPo battery. My plan is to use the BQ24074 to charge the circuit from USB and then boost the output of the BQ24074 to 5V. The 5V device needs between 100mA - 200mA but if possible I would like to be able to use the same circuit to power other 5V projects with different power consumption i the future. Is the TPS61085 a good choice for this?
The datasheet suggests a 3.3uH inductor should work in most cases (assuming 1.2MHz frequency) but also says that the ripple current should be below 35% of the inductor current. If I have calculated correctly I then need at least 10uH with an output current as low as 100mA. Are there any negative aspects (except for size and cost) of choosing a bigger inductor value as long as the saturation current is high enough? Can you recommend an inductor value for this case?
